Friday, 26 March 2010

Connecting your laptop to your TV (make your own 7 pin SVideo to RCA cable)

Following on from the article describing how to make a 4 pin SVideo to RCS cable, Anonymous requested the cable for a 7 pin SVideo to RCS cable.  So here are the instructions… note, I haven’t tested this – just info that I’ve put together from the site. 

So, if you have a laptop with a 7 pin S-Video output and want to watch a DVD on your TV (that didn’t have an S-Video input), here’s how to make your own cable (and save about R150). 
See below for the wiring – you’ll need a ceramic capacitor in the wiring.
Remember, the S-Video plug does not “carry” video signal and the audio – you will need 2 cables: 1 for the video (this one) and another for audio.
image {Thanks to for the images and diagrams pasted below !}

Video cable:

Here’s a 7 pin S-Video plug: image (plugged into the laptop’s S-Video output, and the TV end soldered onto a RCA jack and plugged into the video-in socket on the TV)

Here’s the RCA plug: image  

Here’s the wiring of the S-Video to RCA cable:

Pin S-Video




GND Ground (Y)



GND Ground (C)



Y Intensity (Luminance)



C Color (Chrominance)

Signal through 470pF Ceramic Capacitor


- -

- -


V Composite Video

- -


VGND Composite Ground

- -

Notes (from
* Those 7 pin connectors seen on some PC graphics cards are non-standard connectors for carrying S-video.
* Generally the first four pins on those 7-pin connectors on the same places as the standard four pin S-video connector have practically always the same functionality as those pins in S-video connector.
* The other three pins can have then some extra signals which are not part of S-video (usually some pins of those carry composite video and some control signals, but the use of those three extra pins vary quite much).

* Larger capacitor values will also work, but cause picture to become "softer".
* The impedances and signal levels not matched exactly right, but near enough to work acceptably.

Audio cable:
The audio cable had a small stereo jack on it and plugged into the laptop’s headphone jack, and the TV end had two RCA male connectors and plugged into the audio-in (“Left and Right”) sockets on the TV.
While investigating this article I Googled into which is an absolute mine of valuable information regarding pinouts of cables and connectors for all sorts of devices.  If you need to know how to wire up a connector or cable, then will be your last stop!image

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